Local elliptical galaxies: Some aspects of theory vs. observations

Abstract

In this paper we analyze on, the sample of the local elliptical galaxies, some predictions of various cosmological theories. We start with the sample of ellipticals described in Samurović (2007b) and confront the established concentration parameters and mass-to-light ratios of these objects with various cosmological models, i.e. models given by Navarro, Frank and White (NFW) (1996, 1997) and Burkert (1995), respectively. We find that the bright galaxy (NGC 5846), for which the sum α + β is high, can be reasonably modelled by the NFW models. The Burkert model provides rather good predictions of the dark matter content at one effective radius. There is an indication that bright ellipticals (MB >˜ -21.0) are more dark matter dominated that the fainter ones (MB >˜ -21.0).

Keywords

• galaxies: kinematics and dynamics
• galaxies: elliptical and lenticular
• cD
• galaxies: structure
• dark matter